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| author | Tejun Heo <tj@kernel.org> | 2015-05-22 18:23:27 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-06-02 08:38:13 -0600 |
| commit | e9770b3487328b7e28803caf6c809292dd7adbf0 (patch) | |
| tree | 6214a88ef38a3f661cc731abaf9c112cf0b6e7a6 /mm/page-writeback.c | |
| parent | daddfa3cb30ebfe322d50af146d830fd435ddb1f (diff) | |
| download | lwn-e9770b3487328b7e28803caf6c809292dd7adbf0.tar.gz lwn-e9770b3487328b7e28803caf6c809292dd7adbf0.zip | |
writeback: add dirty_throttle_control->wb_completions
wb->completions measures the wb's proportional write bandwidth in
global_wb_domain and thus naturally tied to the wb_domain. This patch
adds dirty_throttle_control->wb_completions which is initialized to
wb->completions by GDTC_INIT() and updates __wb_dirty_limits() to use
it instead of dereferencing wb->completions directly.
This will allow dirty_throttle_control to represent different
wb_domains and the matching wb completions.
This patch doesn't introduce any behavioral changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index fcebae7db874..5b439fc1e95e 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -127,6 +127,7 @@ struct wb_domain global_wb_domain; /* consolidated parameters for balance_dirty_pages() and its subroutines */ struct dirty_throttle_control { struct bdi_writeback *wb; + struct fprop_local_percpu *wb_completions; unsigned long dirty; /* file_dirty + write + nfs */ unsigned long thresh; /* dirty threshold */ @@ -139,7 +140,8 @@ struct dirty_throttle_control { unsigned long pos_ratio; }; -#define GDTC_INIT(__wb) .wb = (__wb) +#define GDTC_INIT(__wb) .wb = (__wb), \ + .wb_completions = &(__wb)->completions /* * Length of period for aging writeout fractions of bdis. This is an @@ -590,7 +592,7 @@ static unsigned long __wb_calc_thresh(struct dirty_throttle_control *dtc) /* * Calculate this BDI's share of the thresh ratio. */ - fprop_fraction_percpu(&dom->completions, &dtc->wb->completions, + fprop_fraction_percpu(&dom->completions, dtc->wb_completions, &numerator, &denominator); wb_thresh = (thresh * (100 - bdi_min_ratio)) / 100; |